1 | /* Internal function for converting integers to ASCII. |
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2 | Copyright (C) 1994-2024 Free Software Foundation, Inc. |

3 | This file is part of the GNU C Library. |

4 | |

5 | The GNU C Library is free software; you can redistribute it and/or |

6 | modify it under the terms of the GNU Lesser General Public |

7 | License as published by the Free Software Foundation; either |

8 | version 2.1 of the License, or (at your option) any later version. |

9 | |

10 | The GNU C Library is distributed in the hope that it will be useful, |

11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |

12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |

13 | Lesser General Public License for more details. |

14 | |

15 | You should have received a copy of the GNU Lesser General Public |

16 | License along with the GNU C Library; if not, see |

17 | <https://www.gnu.org/licenses/>. */ |

18 | |

19 | #ifndef _ITOA_H |

20 | #define _ITOA_H |

21 | |

22 | #include <limits.h> |

23 | |

24 | /* When long long is different from long, by default, _itoa_word is |

25 | provided to convert long to ASCII and _itoa is provided to convert |

26 | long long. A sysdeps _itoa.h can define _ITOA_NEEDED to 0 and define |

27 | _ITOA_WORD_TYPE to unsigned long long int to override it so that |

28 | _itoa_word is changed to convert long long to ASCII and _itoa is |

29 | mapped to _itoa_word. */ |

30 | |

31 | #ifndef _ITOA_NEEDED |

32 | # define _ITOA_NEEDED (LONG_MAX != LLONG_MAX) |

33 | #endif |

34 | #ifndef _ITOA_WORD_TYPE |

35 | # define _ITOA_WORD_TYPE unsigned long int |

36 | #endif |

37 | |

38 | |

39 | /* Convert VALUE into ASCII in base BASE (2..36). |

40 | Write backwards starting the character just before BUFLIM. |

41 | Return the address of the first (left-to-right) character in the number. |

42 | Use upper case letters iff UPPER_CASE is nonzero. */ |

43 | |

44 | extern char *_itoa (unsigned long long int value, char *buflim, |

45 | unsigned int base, int upper_case) attribute_hidden; |

46 | |

47 | extern const char _itoa_upper_digits[]; |

48 | extern const char _itoa_lower_digits[]; |

49 | #if IS_IN (libc) || IS_IN (rtld) |

50 | hidden_proto (_itoa_upper_digits) |

51 | hidden_proto (_itoa_lower_digits) |

52 | #endif |

53 | |

54 | #if IS_IN (libc) |

55 | extern char *_itoa_word (_ITOA_WORD_TYPE value, char *buflim, |

56 | unsigned int base, |

57 | int upper_case) attribute_hidden; |

58 | #else |

59 | static inline char * __attribute__ ((unused, always_inline)) |

60 | _itoa_word (_ITOA_WORD_TYPE value, char *buflim, |

61 | unsigned int base, int upper_case) |

62 | { |

63 | const char *digits = (upper_case |

64 | ? _itoa_upper_digits |

65 | : _itoa_lower_digits); |

66 | |

67 | switch (base) |

68 | { |

69 | # define SPECIAL(Base) \ |

70 | case Base: \ |

71 | do \ |

72 | *--buflim = digits[value % Base]; \ |

73 | while ((value /= Base) != 0); \ |

74 | break |

75 | |

76 | SPECIAL (10); |

77 | SPECIAL (16); |

78 | SPECIAL (8); |

79 | default: |

80 | do |

81 | *--buflim = digits[value % base]; |

82 | while ((value /= base) != 0); |

83 | } |

84 | return buflim; |

85 | } |

86 | # undef SPECIAL |

87 | #endif |

88 | |

89 | /* Similar to the _itoa functions, but output starts at buf and pointer |

90 | after the last written character is returned. */ |

91 | extern char *_fitoa_word (_ITOA_WORD_TYPE value, char *buf, |

92 | unsigned int base, |

93 | int upper_case) attribute_hidden; |

94 | extern char *_fitoa (unsigned long long value, char *buf, unsigned int base, |

95 | int upper_case) attribute_hidden; |

96 | |

97 | #if !_ITOA_NEEDED |

98 | /* No need for special long long versions. */ |

99 | # define _itoa(value, buf, base, upper_case) \ |

100 | _itoa_word (value, buf, base, upper_case) |

101 | # define _fitoa(value, buf, base, upper_case) \ |

102 | _fitoa_word (value, buf, base, upper_case) |

103 | #endif |

104 | |

105 | #endif /* itoa.h */ |

106 |